Preventing kids from deleting a folder

[Zetro Track]

I have an old Samsung mobile with android 4.1. I have downloaded some cartoons for kids which they frequently enjoy. However, sometimes the kids accidently delete the cartoons and I have to download them again. So my question is that how can I write-protect this "cartoon" folder so that the kids can only watch the cartoons but cannot delete this cartoon folder? Regards

 

[Dannydet]

Install a launcher, such as Nova launcher prime, and set it up for a locked desktop, and only put an icon of the video player on it. With no access to the folder, they can only view the videos now...

 

[Zetro Track]

Install a launcher, such as Nova launcher prime, and set it up for a locked desktop, and only put an icon of the video player on it. With no access to the folder, they can only view the videos now...

Thanks. That did not serve my purpose but after using that launcher I got an idea to hide all other apps from default launcher. Problem almost solved